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By Debora MacKenzie A MAJOR row has broken out in Canada over a proposal to import Norwegian salmon to stock fish farms. The government’s Office of Aquaculture and the farming industry have dismissed fears of escaped salmon wreaking havoc, saying they will enrich the genetic diversity of wild stocks. But last week in Montreal the government’s fisheries scientists warned that escapees could jeopardise the survival of Canada’s wild salmon. Canadian salmon farmers want to import breeding stock from Norway’s highly successful farms. “They want the same opportunity to improve their stock as other livestock producers,” says Dave Conley,